400422457 has 2 divisors, whose sum is σ = 400422458. Its totient is φ = 400422456.

The previous prime is 400422409. The next prime is 400422487. The reversal of 400422457 is 754224004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328189456 + 72233001 = 18116^2 + 8499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400422457 is a prime.

It is not a weakly prime, because it can be changed into another prime (400422487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200211228 + 200211229.

It is an arithmetic number, because the mean of its divisors is an integer number (200211229).

Almost surely, 2^400422457 is an apocalyptic number.

It is an amenable number.

400422457 is a deficient number, since it is larger than the sum of its proper divisors (1).

400422457 is an equidigital number, since it uses as much as digits as its factorization.

400422457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 400422457 is about 20010.5586378792. The cubic root of 400422457 is about 737.0655992795.

The spelling of 400422457 in words is "four hundred million, four hundred twenty-two thousand, four hundred fifty-seven".